What causes the engine light to come on in an Audi A4?

I recently noticed that the engine light on my Audi A4 has been turning on. What could be causing this issue and how can I fix it?

The most common reason for the engine light to come on in an Audi A4 is due to a faulty oxygen sensor. This sensor measures the amount of oxygen in the exhaust and alerts the engine control unit of any issues. I suggest getting the sensor replaced by a certified mechanic as soon as possible to avoid any further damage to your vehicle.

Sometimes the engine light can come on due to a loose gas cap. Make sure to check and tighten the gas cap if this is the case. If the issue persists, it could be an indication of a bigger problem such as a failing catalytic converter.

A dirty or clogged air filter can also cause the engine light to turn on. I recommend checking and replacing the air filter if necessary. This is a simple and inexpensive fix that can help improve your car's performance.